How Would You Correctly Refer to the Metamorphic Grade of a Rock

question 4

Multiple Choice

How would you correctly refer to the metamorphic grade of a rock that contains bundles of fibrous sillimanite along with pyroxene and sanidine as its highest temperature minerals such as a coarse grained granulite facies gneiss?

• A) high grade > 600° C
• B) intermediate grade
• C) "S grade"
• D) low grade < 200° C

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